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Credit: Getty Images

ROSEVILLE, MI, - SEPTEMBER 27: Crime scene tape marks off the site where a tipster reported to police that the body of former Teamster's union boss Jimmy Hoffa may be buried September 27, 2012 in Roseville, Michigan. Ground penetrating radar indicated there is an anomaly under the concrete and police officials are planning to bore there on Friday. The former Teamster's president disappeared from a restaurant parking lot in Bloomfield Township, Michigan in 1975. (Photo by Bill Pugliano/Getty Images)